I am now starting to think seriously about selling my Rel Q200e and replacing it with a 25-31 PC+ SVS subwoofer. I have heard two in action now, both the next model up (20-39) and have been very impressed by both of them in different room situations. My room is slightly different to the both that I heard them in, in that, mine has a wooden floor with uncovered walls (plastered) and few furnishings. Theirs had carpet, plenty of furnishing etc etc. I know that my situation is not ideal for the subwoofer in terms of absorbtion but I still want to improve what I have at the moment. Here is a measurement graph of my current subs performance which may be of help when offering suggestions. So, the crux of the post. Would I feel/hear a substantial difference to what I have at the moment, assuming that I will be planning to upgrade the amp as well in the not too distant future, if i upgraded the sub to this model SVS (the lowest in the PC+ range)? Would the PCi model be sufficient for my needs, my Rel has a 200 watt amp, the PCi a 325 and the PC+ a 525, again, would there be a noticable difference in my environment? Lastly, as I'm a bit of a lazy git and struggle to count normally, can someone who has gone through the process work out approximately how much each model would actually end up costing, door to door, all taxes paid etc? Thanks for the comments.